Index of change
How much a ward was redrawn.
How it's calculated
100 − the percentage of the new ward's electorate that came from its single largest predecessor. 0 = unchanged; high = substantially redrawn.
Worked example
Worked examples will appear once boundary electorate data is loaded.
Where it's used
- Notional Results (coming soon)
Other definitions
Vote shareChange in shareSwing (two-party, Butler)MajoritySwing needed to gainUncontested seatCandidates per seat / per wardContestation rateWinner's shareEffective number of partiesWinner's bonus (seats vs votes)Incumbency and re-election rateWomen candidates and councillorsTurnout (three methods)Council control and No Overall Control (NOC)Majority at riskPsephology National Share EstimateBy-election vote trackerNotional resultSplit-ticket indicatorNational Equivalent Vote